@Book{WMT:2011,
  editor    = {Chris Callison-Burch  and  Philipp Koehn  and  Christof Monz  and  Omar F. Zaidan},
  title     = {Proceedings of the Sixth Workshop on Statistical Machine Translation},
  year      = {2011},
  address   = {Edinburgh, Scotland},
  publisher = {Association for Computational Linguistics},
}